very convenient

I have used this product at conventions and at home with excellent results, 2 tips for potential buyers:

1) 10 minutes or so before the game, place a heavy hardcover book on top of the mat, right in the middle of it, make sure the book covers the 4 central vertices, I've found the PHB enough for this. This way your map will lay flat for the session.

2) I have tried 3 types of markers, permanent, washable and dry erase. I recommend using the dry erase ones.